bonding: fix to rejoin multicast groups immediately

The IGMP specs states that if the system receives a
membership report, it shouldn't send another for the
next minute. However, if a link failure happens right
after that, the backup slave and the switch connected
to this slave will not know about the multicast and
the traffic will hang for about a minute.

This patch fixes it to rejoin multicast groups immediately
after a failover restoring the multicast traffic.

Signed-off-by: Flavio Leitner <fleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 8 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 2a4bb76f2132..25f339672b28 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1269,14 +1269,14 @@ void ip_mc_rejoin_group(struct ip_mc_list *im)
         if (im->multiaddr == IGMP_ALL_HOSTS)
                 return;
 
-        if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
-                igmp_mod_timer(im, IGMP_Initial_Report_Delay);
-                return;
-        }
-        /* else, v3 */
-        im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
-                IGMP_Unsolicited_Report_Count;
-        igmp_ifc_event(in_dev);
+        /* a failover is happening and switches
+         * must be notified immediately */
+        if (IGMP_V1_SEEN(in_dev))
+                igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
+        else if (IGMP_V2_SEEN(in_dev))
+                igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
+        else
+                igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 #endif
 }
 EXPORT_SYMBOL(ip_mc_rejoin_group);